Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Light Lesson 1

2,629 views

Published on

light year 8 science

  • Be the first to comment

Light Lesson 1

  1. 1. LIGHT – Lesson 1 <ul><li>Targets </li></ul><ul><li>1. To know that light is a form of energy which travels away from a source in straight line </li></ul><ul><li>2. To learn that light travels at a very high speed </li></ul>
  2. 2. Making light <ul><li>Light needs an energy source to be created. </li></ul><ul><li>Once created it travels at high speed (3 000 000 metres per second) away from the source </li></ul>
  3. 3. Sources of light <ul><li>Natural sources </li></ul><ul><li>Sun. </li></ul><ul><li>Moon (reflected sunlight). </li></ul><ul><li>Burning wood. </li></ul><ul><li>Lightning </li></ul><ul><li>Stars </li></ul><ul><li>Artificial sources </li></ul><ul><li>Candles. </li></ul><ul><li>Lamps. </li></ul><ul><li>Flashlight bulbs. </li></ul><ul><li>TV. </li></ul><ul><li>Projector </li></ul>
  4. 4. <ul><li>Light travels much faster than sound. For example: </li></ul><ul><li>Thunder and lightning start at the same time, but we will see the lightning first. </li></ul>2) When a starting pistol is fired we see the smoke first and then hear the bang.
  5. 5. How fast does light really travel <ul><li>Across a field in less than one millionth of a second. </li></ul><ul><li>From the Moon in 1.3 seconds </li></ul><ul><li>From the Sun in 8 minutes </li></ul><ul><li>From the nearest star in 4 years </li></ul>
  6. 6. <ul><li>Light travels VERY FAST – around 300,000 kilometres per second. </li></ul>At this speed it can go around the world 8 times in one second.
  7. 7. <ul><li>Light travels in straight lines. </li></ul>
  8. 8. Light travels in straight lines <ul><li>Three screens experiment shows that this is true </li></ul>
  9. 9. Light travels in straight lines <ul><li>Three screens experiment shows that this is true </li></ul>
  10. 10. Amazing fact <ul><li>To see light you have to destroy it, once it enters your eye it does not come out but is absorbed by the cells on the retina! </li></ul>
  11. 11. Shadows <ul><li>Copy the diagram and draw lines to show how a shadow is formed </li></ul>

×